Level 3
Kim had some stickers at first. After he bought another 48 stickers, he had thrice as many stickers as before. How many stickers did Kim have at first?
Level 3
Iris had some candies at first. After she gave away 3 candies to her sister and ate another 3 candies, she went to buy another 42 candies. In the end, she had thrice as many candies as before. How many candies did iris have at first?
Level 3
Kim has 3 bottles of apple juice. Bottle X holds 400 mℓ more than Bottle Y and Bottle Y holds twice as much as Bottle Z. If Bottle Z holds 600 mℓ of juice, how much does Bottle X hold?
Level 3
Mandy put 3452 buttons in three boxes X, Y and Z. Box X and Box Y contained a total of 1825 buttons. Box Y and Box Z contained a total of 2957 buttons. How many buttons were there in Box X and Box Z altogether?
Level 3
There were 40 pupils in a class. 28 of them got an A in a Mathematics test. 22 of them got an A in a Science test. Every pupil got at least an A in the Mathematics test or Science test. How many of them got an A in both the Mathematics and Science tests?
